Fine structure in C-14 cluster emission from Ac-225

A fine structure in the C-14 decay of Ac-225 is predicted quantitatively by accounting dynamical aspects during the disintegration process. Transition s to the excited states of the daughter nucleus are considered to be mainly directed by the Landau-Zener promotion mechanism in the region of avoided crossing levels, The level scheme is evaluated with the superasymmetric two -center shell model. The half-lives are computed considering the cluster de cay as a superasymmetric fission process.